fluctuate波动,起伏:You can’t march in a straight line to the victory, you fluctuate it

flush 脸红:Her cheeks flushed red

forbid 不许,禁止:Wine is absolutely forbidden to all the children

forge锻炼:forge a horse-shoe out of an iron bar

formulate规划(制度等),构想出(计划方法等)formulate a policy

fracture 裂缝,裂痕: a fracture in the pipe

frequent时常发生的,频繁的:His trips to France are less frequent now

frown 皱眉:frown at sb

frustrate 挫败,阻挠,使灰心,使无效:frustrate a plan

fulfill (fulfilled, fulfilling)履行,实现,完成: fulfill a contract

furnish供应，提供：furnish blankets for the refugees

fury狂怒，暴怒：fly into a fury

fuss大惊小怪，乱忙，小题大做：make much fuss over losing a penny

gallop (马等的)飞跑，疾驰：The horse did a fine gallop during the race

gamble赌博：gamble at cards

gasp 喘气，喘息：speak between gasps

gear齿轮，传动装置，(排)档：interlock cogs and gears

generalize 归纳，概括:I don’t think you can generalize about what voters will do

generate 产生，发生(电、热、光、力、摩擦力等)：generate electricity

genuine 真的，非人造的，名副其实的：genuine leather

gesture 手势，示意动作：raise one’s hands in a gesture of despair

glare 怒视，瞪眼：give the jury a glare

glimpse 一瞥，一看：have a glimpse of (into)sth

glitter 闪闪发亮(或发光)，光彩夺目，闪耀：His language glitters with marvelous words